166722672547 has 4 divisors (see below), whose sum is σ = 166925252560. Its totient is φ = 166520092536.

The previous prime is 166722672521. The next prime is 166722672551. The reversal of 166722672547 is 745276227661.

166722672547 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166722672547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166722672247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101288772 + ... + 101290417.

It is an arithmetic number, because the mean of its divisors is an integer number (41731313140).

Almost surely, 2^166722672547 is an apocalyptic number.

166722672547 is a deficient number, since it is larger than the sum of its proper divisors (202580013).

166722672547 is an equidigital number, since it uses as much as digits as its factorization.

166722672547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202580012.

The product of its digits is 11854080, while the sum is 55.

The spelling of 166722672547 in words is "one hundred sixty-six billion, seven hundred twenty-two million, six hundred seventy-two thousand, five hundred forty-seven".